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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcdf28d6c68a2e629db915b4ef34626b635633b1aa82e0a0b2b8efca85ad76c' 
  AND token = 'tNz34N4q+XDkhN0wdeNaQc1DUhDkwiXZos6PBM8Vhmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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