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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbec2581ef29f99511bdefe027c6db31f61f110f476e035804cafc2767fd4664' 
  AND token = 'w08bgOLFsFJUyEjR5VS6rGFJwvP8gEhC3vTHgkKf1yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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