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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2d8ccd1802c15f62b2b2a0afaaa6010e7917eae57aa14eee7bf39bb8f02e4c' 
  AND token = 'DYJPljE9MAAAFdWCbl8IshaD5Om4dGbdveujGfkGDPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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