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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09b1fbea654ae15230ed0685fc1443d2e0541a6e823cb0a7a037e02ba8fc9bb' 
  AND token = '9JgTGa6Cjg1MH5e49dIImX2Ls9xoKEP/TT0dxZwVpU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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