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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94664bc5c8e562eb0c5e06f9c8269257d91fca4df1b2927dd11c049d208eb657' 
  AND token = 'eD3soG8iTqg00Z8fSGpoe/8wfF+C03kGCGlvtZkiJCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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