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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a434229369bce0543aaa77ac13bbc02f3002b59d03c1803bd8c6c4e26261d7' 
  AND token = 'X3vAbhdgdWCH/HzXmh9178HUL7j7oN2BNP3tlaUTfcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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