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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802bfba535b182c286cdb93f547c6301344d34097bf4ba22351912d3cc708fff' 
  AND token = 'A2zSGtclPF0Fl8IRC/qMiEj1rj9HSBm5fX2Es/5MEV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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