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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2f45068f06637b16ee1762a055ba89009f9c34be66d77b777197f3d9e4d046' 
  AND token = 'djRlhalaULRDM5iI5D1fs8KyLEDB+hgap+su/lSdOjY=' 
  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"
    }
  }
}