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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c6238a1b2b0ac4f12e8662f59b7f2fc02bd6a5c478e21093688fe5cbd260a4' 
  AND token = 'alHf2iGzteqIHrXPVklsKKIB+Ns6zTN9nLx4sKDh8kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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