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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f711da89d5c8564e085e9252bff6cf6d969c61d003b6d065263ac9a1c7307cdb' 
  AND token = 'L2Gl9bBUmVhxEcr+Mr2HO2VXysgRgcu95MOWC5Evp/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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