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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14243feaa35ef66a4e9c76752964eeb2ecc827444f328fbf39b00627742407de' 
  AND token = '/cjs0+6fKH2SNE07m70Q0g49ACJYdhTrWQ8aleFzWZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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