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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012eb10850a0413ddf4668d124132fca29c859ead88b0b1d47ae90795dd9ebc9' 
  AND token = '32Uj5NqEKSsA13RoNvfHwh+I3+JjyUC2Rt9K5+OYtfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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