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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457c5057e0b5db1b7aa5d4697eca7d2dd87b50e3f7c2bee367a0f865aa6b00fa' 
  AND token = 'brWTyw3wM2+Yz+jqXhY8oU4sZDc/I6nwN97YxKd9TII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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