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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98028e2d5a41a0c2b97270b1133378cecb7b8c0b41dd86c3cef2e141a845791' 
  AND token = '2AZJ/Ctin19mjVJ/HyCWd0qi4dAFX/Xex/oarxpDY3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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