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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9200adae84b24c9bafd897e480474070e784450a1577c70e1925029bb12fc746' 
  AND token = '5qrr+cG5J5v+EyPcrfDBW2L0k1y3UlH7bl156onu6ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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