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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58820ebb3c48b49dcf210f151cd0ce560fb48ca6f9921564adcc5c850f79018' 
  AND token = 'uMtKxQ77y0Y/Uy+3MREx1w2S5ymTyEjs7TdkEHoT+mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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