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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb0c5f6285b49d0817e24a0f9c221fc44aa0e577ea4e25f12646a36975fcb00' 
  AND token = 's8PBcrihiBeR5zevQ3+oJ+fYKJgClauP1ij6XoWnVeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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