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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b289763044067ae9136b69469256b9bcf535270e2df168cc60d0eedfe7a56a7' 
  AND token = 'B92/MFXHIGf1Sw1OF7+9XEY/2mslMLP5I/gqjTTY71w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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