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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db603f9f2be273e22075854c2bded1ffb377f3e43d5ad69bbd67fb78469a701' 
  AND token = 'D37ydKrbs7urso4AtDuqSQhl9ncmt89y1F8meJP/eRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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