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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fd18ff5d9936f2be580002111184b4170c8246426df97d70a0efb53962fa84' 
  AND token = 'skBrYkVxEFNr5pzEJ3CMbFCw3X6yjsV/I3Bf+BbY8Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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