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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a20e902a9fbe775422fe8bf2a5e90c8585a7cc6cd0f75cb06ce76d653808cb6' 
  AND token = 'V9EFtGp6e/uzrFZHvdzUXqnstJPpcczbRbSP+brmdLE=' 
  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"
    }
  }
}