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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be857a9dae0232506d304b0ccf51e3e3d530b320f7695999c905ff0f856e1b44' 
  AND token = 'BF434YCbYAGolH+s9RjZbWzkoxpInwEoPmJ2p4glp1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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