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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507010770b0d5a07030869f7bdf790f9e1047b3cb395d3658a625789d332fd2b' 
  AND token = 'Pp+BwC3c444hBL05JRHIvQ3f+ZIiRZF185hPePi1KEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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