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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68861a3f80bc8c423c2b2ee87b0115069c1c676c79dca43ac4d65ccedbef54da' 
  AND token = 'LifMoQwFXE1Z5GiCK0OXhASE6MNW39MpQc0GLlgo1FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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