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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360474863290275358a8e52981f9cf98d877289fac3c6c01aaac69032bea746e' 
  AND token = 'zNNErejTdF8WRzAMLA4W1bbQp5bVYGKhZQgpU2LKm8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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