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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7c740d8c8c3e3cb3d390e7bf4a591ea810b09b1e11ee1f827e6ab5fe812d3d' 
  AND token = 'dFdA1Pt14kAwEe9LMh/r1czlwNIGgZWJzaz7FpKx+sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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