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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21ed1273ff9aaa8d7cf005af444b3662a1f5ce9171bf892b0b37b14ee9d899d' 
  AND token = '875GRJdIP6KeMJcgOMeaG39fYBJyHldG+fTRmDfrfNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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