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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca54301f4938011eab31d495fec60073a52a77f8a8fce5e26e929934ee41755f' 
  AND token = '++40Xq/JB40baEpF+Uw/KtSeyF+tgncXDmSjYNTyPNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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