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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c904a403e1c53fb4e5890928ba8bd5c805f94ea0933f2ef8bd4586feff6be0' 
  AND token = '41dGCoolNgNKmH3iq7/ws6UVYVn2qk8lMqEhUhoq/jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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