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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcf4adb9b462ec4611a96213c5c4ba23094b003a00a6dca9837bc46950915fd' 
  AND token = 'fB5E4ep0yV6qFQV/omV/nR2sNQIDbmJwHfX3rJUCUsI=' 
  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"
    }
  }
}