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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1f4c1dbdeadb2044abacd2d3e7d49964577384e8218dd3d75e25089ac89e96' 
  AND token = 'zgkcC8be3p+iQpcE6oQ3m8nG4BP2tJ2s7SGGPccet3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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