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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9533badbc0fd74b82d7db80548eb09a30133829e3924195f70ca60b8a9208eff' 
  AND token = 'OMI8a73GXXSGSdPPkgk0Ssc1I0MdDnvn9POT4rhGPpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}