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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c86dbc6b2ecf2ce09e0fb956fe94d1749308dc06f23554c5c0e6900563210c' 
  AND token = '6ly00C4e0O/mj2h5Aw8oscrHERXI5+LSzBhPNarkvQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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