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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a84398abe5f0ef4a27f23b7ee7f926df9fb9fbc2be27b850c8d9aadbe5d9a3' 
  AND token = 'cN7CPO120//nP4dP3AJDFeyvFZZV/HS5VsZsmqz3PzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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