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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b091029a0eb4056cfeb4e01b9196e8f69212d5a97f31d576b17c3514f8782fab' 
  AND token = 'C2CtO8Orvy2vVEhP+ndCq9ca9+s1gxPE4t/O4dqfayI=' 
  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"
    }
  }
}