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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5875b83709735cb28dc6ca4a559ace1ed4624a64597e2c6527c3596482b36ba4' 
  AND token = 'apAsQf3BNZyS43sCs5TaI3j8hixsJ4ptoMUD457cqN0=' 
  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"
    }
  }
}