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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58809bd118f1b0b36ed1bce4c94d4e66b92836a13a6b147c905a9ee8e4126ce4' 
  AND token = 'cpxATSz3AFz9w8K9UWEWZDX1eSYKwvh7kY+zgoy2ojM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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