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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505cf9f3eac556f45a2d0b4cbaa31dfdf95ea1d854b717f0d12ff69c03710190' 
  AND token = 'GnwCVUqiexsoti1Dx/5gr8d0cvWHFNlrWS+PxaRQU40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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