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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143d3368bcb0731a123bf3da46ce21ea8e99eda94455c46715dfd9f55fb85899' 
  AND token = 'Uh9hsLbO/tHs/04tTBx6Zsg8VIz/bFM6Z/afctXfhYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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