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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6fb14f40edb1d0de6d41167b7fcb92c36614a910ca37c8569c224ed32a473' 
  AND token = 'g3PB/ltsCsNA8E88GSzSMhz/N96IAhlNFEKWETLNW/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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