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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c5aabce3c1e6b847fef1b121edcaa4c65b2bcef52226eeac5c873be5dc370f' 
  AND token = 'mcpG/ICELyQ+NGXTe5xwjZsADF4Ucm7B2C3axdWt6NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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