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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced9d3b6fbdb876d8f20dc912671a452a0f40e81da1588c3470e45a07212c85f' 
  AND token = 'BYJvA7b1RsaGC4Tt+xyiJFBMw3jhyFmcNXe7P10AhEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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