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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f767639816ac465e8a32be3217bc4fad94758748db54b8cff56c03a49d0fb2' 
  AND token = 'ifLF0/L9UMe8CUrHazD14jZ/Uua2nmzeaYtB80dg+3U=' 
  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"
    }
  }
}