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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d94b1b0feab5c3a0dba17c9cb2e937c0518910c79ae5dd4589cc3b4e26102f' 
  AND token = 'frCKFsgmv58RyBDPtLgWHWuEzMVEl0y6z57DwZVFdpY=' 
  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"
    }
  }
}