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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1986ba4ebb7e7b1f9074d5edad8e2a4701936ea67487763725aff6d8e6e62a' 
  AND token = 'nDzyVd+jmuZy1cjWpbtH6BH3lxiMunT1VZ7UIJjrr4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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