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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a6c9d0e9abab6443dae093ad4214d06e9862b1d948bc81f7c20637a730cb66' 
  AND token = 'QVfrJIIEJQJ3RXE0/EdYHSSmWZ3eKJDmVTuiLZs9VbY=' 
  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"
    }
  }
}