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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0bd47d0d0a419ef0f1a7b9cbe218d19e25db466f12cb435f9f7630d4306a7d' 
  AND token = 'htgfO9NoHJT2Lzr8MxDRo6Xsje7JoWSy7cuE4IeydnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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