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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3f23613e32a7af22dcf7c51153cba8d67c4f272cd3340606cd948b563d1ac1' 
  AND token = 'g/MhPWsEy9fvFbR74NF8prR+iTyaj6Zi5bEQsU7xF/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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