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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808fdc20aa36cb81de5f173f11dc3dac0cb60f3d22aca6aabea351ee0b752c9e' 
  AND token = 'L/vXHFnH54ZhJwYKHwei7CrMAYRFe6Rs2cSn0s9E5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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