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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a56667d83d75eefbe63f4e25a02f5b6547ee6cd9b748f6687e27f6aa1360ae0' 
  AND token = '1whxyJcaNV88gEcX3dknfb2p27nNEZalfe/nz7ymZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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