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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6431ba0fedf32fbd2eda5a58841f7f5b65d8aec88171461023f5a1f282e1fc6' 
  AND token = '+VRRthxJZ8a6epAa+nb8NvQXLfZ3CNPSeDpj1SYw2Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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