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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58c7788228c312ce10896e7e5167a84baee536c054a3317c7589f7a7cd53cac' 
  AND token = 'bqVqvfXzrCjWcl/V23DfXTU9Ljbq4Bq75lzzb5+gfgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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