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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f66c33d12ac3fb24828a8bcfc484a3dbaca82c4e534bd77bcd973aa9c5c54f' 
  AND token = 'Fym+SLWknDN9FBszUa7xRahiZZrMyfAWiyvOfcDfrbw=' 
  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"
    }
  }
}