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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf748a9a58e6a46db5e0d4b4d3cb38f79169fdd19b831aa7d171a2a201c693b8' 
  AND token = '9pyxp0GPHHpWfd9+UcoQ37I22W1uWkeKNFio2FGuAag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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