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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4b5189ba250b8c4d84f8f0290a8a6c58aae3a9d2187424cd01dd2132096675' 
  AND token = 'lBUKbv9Vmxgt+fBwKwm/T5W5x7uTZoVbXx8knTRW9Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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