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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619322bcefe32803a7bef143cd566b86c1ee4ba72686a794d15696b22a65abef' 
  AND token = 'SbH7pt7aeKGIv0y3igdksk+QPASR8kjf6aNceDUQml0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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