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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96152b61f35923e3d7c1216657805d55827395695e8ff96ca2a5d29e152e6f34' 
  AND token = '5XSXY3Og3RF7j7NLPzbFX+VpFXed2uao2ewETrpd7EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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